Best available copy



BEST AVAlLABLE COPY DEFENSIVE PUBLICATION SEARCH ROOM UNITED STATESPATENT OFFICE Published at the request oi the applicant or owner inaccordance with the Notice of Apr. 11, 1968, 849 0.6. 1221.Identiflcntion is by serial number of the application and the headingindicates the number of pages of specification, including claims, and ofsheets at drawing contained in the application as originally tiled. Thetile or this application is available to the public for inspection;reproduction may be purchased for 30 cents per sheet.

Applications published under the Defensive Publication Program have notbeen examined as to the merits of alleged invention. The Patent Omcemakes no assertion u to the novelty of the disclosed subject matter.

PUBLISHED MAY 27,1969

in which one of R or R is alkyl and the other has the formula RCOOCH inwhich R is alkyl are useful as plasticizers for polymeric resinousmaterials, particularly .polyvinyl chloride. The novel iriesters aremanufactured by reacting a glycol monoester with glycolic acid and bythen reacting the resulting productwvith an alkanoic acid.

Il -COO

